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Tool: The Abacus in Various Number Systems
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Go to: http://www.cut-the-knot.org/Curriculum/Arithmetic/Abacus.shtml (opens a new window)
Description: An interactive Java applet showing one or two Russian abacuses with options to select the base of the number system and the number of wires. The applet displays the number matching the current configuration and performs an automatic carry. The abaci can be synchronized so that adding to one removes an equal number from the other. Bogomolny links to a page discussing the history and use of the abacus.
Technology Type: Java Applet 
Author: Alexander Bogomolny
Language: English 
Cost: Does not require payment for use

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